Not a lot to go with based on your description. If I was to start looking for this, I’d start with:
- source and its encoding, as well as the sound mode the receiver is in. Stereo and particularly Pure may not engage the Subwoofer, check your manual to make sure.
- crossover settings and having all speakers set to Small. If they are set to Large, the low frequencies stay with these speakers.
You said that you checked all relevant settings, apologies for mentioning them.
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